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LRI64-A1S/XXX Datasheet(PDF) 10 Page - STMicroelectronics |
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LRI64-A1S/XXX Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 38 page  LRI64 10/38 COMMUNICATIONS SIGNAL FROM LRI64 TO VCD ISO 15693 and ISO 18000-3 Mode 1 standards define several modes, for some parameters, to ca- ter for use in different application requirements and noise environments. The LRI64 does not sup- port all of these modes, but supports the single subcarrier mode at the fast data rate. Load Modulation The LRI64 is capable of communication to the VCD via the inductive coupling between the two antennas. The carrier is loaded, with a subcarrier with frequency fS, generated by switching a load in the LRI64. The amplitude of the variation to the signal, as re- ceived on the VCD antenna, is at least 10mV, when measured as described in the test methods defined in International Standard ISO10373-7. Subcarrier The LRI64 supports the one subcarrier modulation response format. This format is selected by the VCD using the first bit in the protocol header. The frequency, fS, of the subcarrier load modula- tion is 423.75kHz (=fC/32). Data Rate The LRI64 response uses the high data rate for- mat (26.48 kbits/s). The selection of the data rate is made by the VCD using the second bit in the protocol header. Bit Representation and Coding using One Subcarrier, at the High Data Rate Data bits are encoded using Manchester coding, as described in Figure 10. and Figure 11. Logic 0. A logic 0 starts with 8 pulses of 423.75kHz (fC/32) followed by an unmodulated period of 18.88µs as shown in Figure 10. Figure 10. Logic 0, High Data Rate Logic 1. A logic 1 starts with an unmodulated period of 18.88µs followed by 8 pulses of 423.75kHz (fC/32) as shown in Figure 11. Figure 11. Logic 1, High Data Rate AI06663 37.76 µs AI06664 37.76 µs |
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